size(300,300);
point(140,140);
point(160,140);
point(160,160);
point(140,160);

point(140,160);
point(140,161);
point(140,162);
point(140,163);

stroke(20,20,50);
line(10,10,10,290);
line(10,10,290,10);
line(290,10,290,290);
line(10,290,290,290);

stroke(50,50,100);
line(20,20,20,280);
line(20,20,280,150);
line(280,150,20,280);

stroke(0,0,0);
noFill();
rect(50,50,50,50);
fill(0,255,0);
rect(100,100,50,50);
fill(0,0,255);
rect(150,150,50,50);
fill(255,255,255);
rect(150,50,50,50);
rect(50,150,50,50);

noFill();
stroke(255,0,0);
rect(250,250,30,30);
stroke(0,0,255);
rect(260,260,30,30);